Externally Excited Synchronous Machine Rotor Temperature Signaling
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Solution Overview
Problem
Existing externally excited synchronous machines face challenges in accurately estimating rotor temperature, leading to overdimensioning and increased costs due to erroneous temperature calculations, and existing solutions like inductive energy transmission or additional sensors result in design space inefficiencies and friction losses.
Innovation Solution
Incorporating a temperature sensor device with a communication device that uses the power supply pathway for transmitting rotor temperature data to an evaluation device, eliminating the need for additional contacts and reducing friction losses, and allowing for flexible implementation in various machine types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive energy transmission is used to transmit temperature data to the rotor, then temperature monitoring is enabled, but additional components are required significantly distant from the rotor center, resulting in rough temperature estimation and increased implementation expense
Solution Approach 1:
The patent combines the temperature data transmission function with the existing power supply pathway by using the same slip rings and contact elements that supply power to the exciter winding. This merging eliminates the need for separate inductive transmission components, reduces implementation expense, and enables precise temperature monitoring at the rotor center.
Solution Approach 2:
The power supply pathway components (slip rings and contact elements) are made multi-functional by using them both for power transmission to the exciter winding and for transmitting temperature data from the rotor. This universality reduces the number of additional components needed and lowers implementation costs.
2Measurement precision
If temperature sensors are arranged in the rotor and read out via slip contacts, then rotor temperature can be directly measured, but additional slip contacts are required, increasing design space usage and internal friction
Solution Approach 1:
The patent merges the temperature data transmission function with the power supply function by using the same slip rings and contact elements for both purposes. This eliminates additional slip contacts, reduces design space usage, and decreases internal friction in the electric machine.
Solution Approach 2:
The existing power supply slip rings and contact elements are made multi-functional by using them to transmit both power to the exciter winding and temperature data from the rotor. This universality avoids the need for additional friction-generating contacts.
3Device complexity
If calculation or estimation methods are used to determine rotor temperature, then no additional hardware is needed, but the estimation is prone to error, leading to overdimensioning and increased costs
Solution Approach 1:
The rotor itself generates and transmits its own temperature data through the existing power supply pathway. The temperature sensor in the rotor self-measures and self-transmits its temperature information via the slip rings, eliminating the need for complex external estimation systems while providing accurate real-time temperature data.
Solution Approach 2:
The system implements feedback by continuously monitoring the rotor temperature through sensors and transmitting this data back to the control system via the power supply pathway. This real-time feedback enables accurate temperature-based control decisions without overdimensioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise rotor temperature monitoring with reduced design space and cost, enhancing the efficiency and reliability of externally excited synchronous machines, particularly in motor vehicle applications.
Implementation Method 1
the transmission route for the transmission of the communication signal from the communication device to the evaluation device is formed at least partly by a section of the power supply pathway
Data Source
AI summary
An externally excited synchronous machine having an exciter circuit, a stator, and a rotor. The rotor carries at least one exciter winding which, in operation, generates an exciter field, wherein the exciter winding, in operation, is excited by the exciter circuit along a power supply pathway, wherein the rotor includes at least one temperature sensor device having a communication device which, in operation, transmits a communication signal regarding a temperature of the rotor to at least one evaluation device, and wherein the communication signal is transmitted from the communication device to the evaluation device by a transmission route at least partially formed by a section of the power supply pathway.